Have a look at this article, very interesting (pear tree rust is at the bottom of the page) - it seems you can, sometimes, manage this problem depending on the severity and time of year:
I start picking the leaves off and burning them as soon as the rust starts appearing each year, so that the spores don't fall to the ground and reinfect the tree the following year. So far I've not yet ended up with a totally naked tree ... and as it's an espalier it's halfway naked already
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
My understanding of pear rust (which may be wrong) is that the spores that are created on the pear tree leaves are designed to only infect species of juniper. The spores formed on the leaves of pears cannot reinfect a pear tree. I guess the same is true re. the juniper
Billericay - Essex
Knowledge is knowing that a tomato is a fruit. Wisdom is not putting it in a fruit salad.
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Not much you can do about it I'm afraid.
Some info from the RHS here
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.
https://www.gardenfocused.co.uk/fruitarticles/pears/pest.php
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Worth mentioning that my pot grown olive tree is susceptible to rust too.
I pick off leaves as they start to show signs and throw them in the bin (not in compost heap, as they can reinfect).
I also remove amy dried leaves that have already fallen, from the surface of the soil, to prevent spores reinfecting.
So far, as well as making sure it has good air circulation around it and doesn't get stressed during times of drought, it has survived.
I guess the same is true re. the juniper
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.